I think theres just so much shit going on in an airplane that the brain short circuits and doesnt think about the fact that you are in a disturbingly thin walled, air sealed aluminium can hurtling through the sky at 800+kph with a hundred other people, most of whom dont have the common sense the gods gave a common rock, and are riddled with disease that you are no doubt being exposed to due to being crammed in like sardines.